Multiple criteria in a lookup field

Multiple criteria in a lookup field

I have a lookup field in form "Dispute" which looks up data in a form named "User", and which uses as a criteria "User_Type == "A". 

This works fine. But in addition to the above criteria, I also need to add as a criteria where the field "User_Country" in the User form = the field "Country" in the Dispute form, so that the user does not need to scroll through lists of users that are not relevant to the country.

I tried to look this up in help and forums, but I couldn't find how to do this. Could someone help me with this?

Thanks in advance!